Diamond



FIG. 1 is a top view of a diamond showing my new design;

FIG. 2 is a bottom view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a left view thereof;

FIG. 6 is a right view thereof; and,

FIG. 7 is a perspective view thereof. 

The ornamental design for a diamond, as shown and described. 